/Engine/Source/Runtime/Engine/Public/Net/RPCDoSDetection.h
If RPC monitoring is disabled, does extremely lightweight tracking of RPC calls, for monitoring tracking triggers, and to allow a chance for deducing full RPC tracking information if monitoring is enabled while receiving (so that e.g. if an RPC DoS attack enables monitoring, information on the RPC responsible can be recovered).
void LightweightReceivedRPC ( [UFunction](API\Runtime\CoreUObject\UObject\UFunction) * Function, [FName](API\Runtime\Core\UObject\FName) FunctionName )